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Reports methods with a <b>boolean</b> return type, which are only used in a negated context.
Due to performance reasons some methods might not be reported during in-editor highlighting.
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For example:
<code><pre>
<b>class</b> C {
  <b>boolean</b> inverted() {
    <b>return</b> <b>true</b>;
  }

  <b>void</b> f() {
    <b>if</b> (!inverted()) {
      <b>return</b>;
    }
  }
  <b>boolean</b> member = !inverted();
}  
</pre></code>
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